Dial-a-Ride has a total fleet of 305 buses in service. Transport for London (TfL) has replaced older buses with 90 new, ULEZ compliant, Euro VI vehicles, comprising 30 per cent of the overall fleet. Only these ultra-clean buses are used for any passenger journeys within the ULEZ zone.
In total, 70 per cent of existing Dial-a-Ride vehicles do not comply with ULEZ. Whilst these buses do not enter the central London zone, TfL is currently in the process of procuring 186 ULEZ-compliant vehicles, meaning the entire Dial-a-Ride fleet will be compliant when the ULEZ expands in 2021. The projected future fleet requirement is a total of 276 vehicles.